Salisbury biochar did not affect the mobility or speciation of lead in kaolin in a short-term laboratory study

Shen, Z., McMillan, O., Jin, F. and Al-Tabbaa, A. (2016) Salisbury biochar did not affect the mobility or speciation of lead in kaolin in a short-term laboratory study. Journal of Hazardous Materials, 316, pp. 214-220. (doi:10.1016/j.jhazmat.2016.05.042) (PMID:27236430)

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Abstract

Salisbury biochar (produced from British broadleaf hardwood) with two different particle sizes (≤2 mm and ≤0.15 mm) was applied on a kaolin with three different lead (Pb2+) contamination levels (50 mg/kg, 300 mg/kg and 1000 mg/kg) at the dosage of 1% in w/w. The short-term impact of biochar on the mobility and speciation of Pb2+ in the kaolin was investigated using attenuation periods of 1, 7 and 28 days. The leachability and extractability of Pb2+ in carbonic acid leaching and EDTA extraction tests as well as the speciation of Pb2+ in soils were not significantly affected by biochar treatment during all periods. The insignificant effects of biochar on Pb2+ immobilisation were most likely attributed to the high adsorption capacity of Pb2+ on the kaolin and biochar failed to competitively adsorb Pb2+ against kaolin. The kaolin immobilised Pb2+ primarily through cation exchange, which represents the readily bioavailable fractions of Pb2+ in soils and may still pose environmental risks. This paper suggests the inefficiency of biochar treament on heavy-metal contaminated clay-rich soils. Therefore a laboratory treatablity study with respect to the soil type may be crucial when large-scale biochar applications in heavy-metal associated soil remediation are evaluated.

Item Type:Articles
Status:Published
Refereed:Yes
Glasgow Author(s) Enlighten ID:Jin, Dr Fei
Authors: Shen, Z., McMillan, O., Jin, F., and Al-Tabbaa, A.
College/School:College of Science and Engineering > School of Engineering > Infrastructure and Environment
Journal Name:Journal of Hazardous Materials
Publisher:Elsevier
ISSN:0304-3894
ISSN (Online):1873-3336
Published Online:13 May 2016
Copyright Holders:Copyright © 2016 Elsevier B.V.
First Published:First published in Journal of Hazardous Materials 316: 214-220
Publisher Policy:Reproduced in accordance with the publisher copyright policy

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